Commit | Line | Data |
---|---|---|
3323eec9 MZ |
1 | /* |
2 | * Copyright (C) 2005,2006,2007,2008 IBM Corporation | |
3 | * | |
4 | * Authors: | |
5 | * Reiner Sailer <sailer@watson.ibm.com> | |
6 | * Serge Hallyn <serue@us.ibm.com> | |
7 | * Kylene Hall <kylene@us.ibm.com> | |
8 | * Mimi Zohar <zohar@us.ibm.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License as | |
12 | * published by the Free Software Foundation, version 2 of the | |
13 | * License. | |
14 | * | |
15 | * File: ima_main.c | |
e0d5bd2a | 16 | * implements the IMA hooks: ima_bprm_check, ima_file_mmap, |
9bbb6cad | 17 | * and ima_file_check. |
3323eec9 MZ |
18 | */ |
19 | #include <linux/module.h> | |
20 | #include <linux/file.h> | |
21 | #include <linux/binfmts.h> | |
22 | #include <linux/mount.h> | |
23 | #include <linux/mman.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
2fe5d6de | 25 | #include <linux/xattr.h> |
d5813a57 | 26 | #include <linux/ima.h> |
3b370b21 | 27 | #include <linux/iversion.h> |
3323eec9 MZ |
28 | |
29 | #include "ima.h" | |
30 | ||
31 | int ima_initialized; | |
32 | ||
2fe5d6de MZ |
33 | #ifdef CONFIG_IMA_APPRAISE |
34 | int ima_appraise = IMA_APPRAISE_ENFORCE; | |
35 | #else | |
36 | int ima_appraise; | |
37 | #endif | |
38 | ||
c7c8bb23 | 39 | int ima_hash_algo = HASH_ALGO_SHA1; |
e7a2ad7e | 40 | static int hash_setup_done; |
c7c8bb23 | 41 | |
3323eec9 MZ |
42 | static int __init hash_setup(char *str) |
43 | { | |
e7a2ad7e MZ |
44 | struct ima_template_desc *template_desc = ima_template_desc_current(); |
45 | int i; | |
46 | ||
47 | if (hash_setup_done) | |
48 | return 1; | |
49 | ||
50 | if (strcmp(template_desc->name, IMA_TEMPLATE_IMA_NAME) == 0) { | |
51 | if (strncmp(str, "sha1", 4) == 0) | |
52 | ima_hash_algo = HASH_ALGO_SHA1; | |
53 | else if (strncmp(str, "md5", 3) == 0) | |
54 | ima_hash_algo = HASH_ALGO_MD5; | |
ebe7c0a7 BW |
55 | else |
56 | return 1; | |
e7a2ad7e MZ |
57 | goto out; |
58 | } | |
59 | ||
60 | for (i = 0; i < HASH_ALGO__LAST; i++) { | |
61 | if (strcmp(str, hash_algo_name[i]) == 0) { | |
62 | ima_hash_algo = i; | |
63 | break; | |
64 | } | |
65 | } | |
ebe7c0a7 BW |
66 | if (i == HASH_ALGO__LAST) |
67 | return 1; | |
e7a2ad7e MZ |
68 | out: |
69 | hash_setup_done = 1; | |
3323eec9 MZ |
70 | return 1; |
71 | } | |
72 | __setup("ima_hash=", hash_setup); | |
73 | ||
8eb988c7 | 74 | /* |
890275b5 | 75 | * ima_rdwr_violation_check |
8eb988c7 | 76 | * |
890275b5 | 77 | * Only invalidate the PCR for measured files: |
2bb930ab | 78 | * - Opening a file for write when already open for read, |
8eb988c7 MZ |
79 | * results in a time of measure, time of use (ToMToU) error. |
80 | * - Opening a file for read when already open for write, | |
2bb930ab | 81 | * could result in a file measurement error. |
8eb988c7 MZ |
82 | * |
83 | */ | |
f7a859ff RS |
84 | static void ima_rdwr_violation_check(struct file *file, |
85 | struct integrity_iint_cache *iint, | |
1b68bdf9 | 86 | int must_measure, |
f7a859ff | 87 | char **pathbuf, |
4e8581ee RS |
88 | const char **pathname, |
89 | char *filename) | |
8eb988c7 | 90 | { |
c77cecee | 91 | struct inode *inode = file_inode(file); |
8eb988c7 | 92 | fmode_t mode = file->f_mode; |
ad16ad00 | 93 | bool send_tomtou = false, send_writers = false; |
a178d202 | 94 | |
8eb988c7 | 95 | if (mode & FMODE_WRITE) { |
14503eb9 | 96 | if (atomic_read(&inode->i_readcount) && IS_IMA(inode)) { |
f7a859ff RS |
97 | if (!iint) |
98 | iint = integrity_iint_find(inode); | |
14503eb9 | 99 | /* IMA_MEASURE is set from reader side */ |
0d73a552 DK |
100 | if (iint && test_bit(IMA_MUST_MEASURE, |
101 | &iint->atomic_flags)) | |
14503eb9 DK |
102 | send_tomtou = true; |
103 | } | |
b882fae2 | 104 | } else { |
0d73a552 DK |
105 | if (must_measure) |
106 | set_bit(IMA_MUST_MEASURE, &iint->atomic_flags); | |
1b68bdf9 | 107 | if ((atomic_read(&inode->i_writecount) > 0) && must_measure) |
b882fae2 | 108 | send_writers = true; |
8eb988c7 | 109 | } |
ad16ad00 | 110 | |
08e1b76a MZ |
111 | if (!send_tomtou && !send_writers) |
112 | return; | |
113 | ||
bc15ed66 | 114 | *pathname = ima_d_path(&file->f_path, pathbuf, filename); |
ea1046d4 | 115 | |
ad16ad00 | 116 | if (send_tomtou) |
8d94eb9b RS |
117 | ima_add_violation(file, *pathname, iint, |
118 | "invalid_pcr", "ToMToU"); | |
ad16ad00 | 119 | if (send_writers) |
8d94eb9b | 120 | ima_add_violation(file, *pathname, iint, |
08e1b76a | 121 | "invalid_pcr", "open_writers"); |
8eb988c7 MZ |
122 | } |
123 | ||
f381c272 | 124 | static void ima_check_last_writer(struct integrity_iint_cache *iint, |
2fe5d6de | 125 | struct inode *inode, struct file *file) |
bc7d2a3e | 126 | { |
4b2a2c67 | 127 | fmode_t mode = file->f_mode; |
0d73a552 | 128 | bool update; |
bc7d2a3e | 129 | |
2fe5d6de MZ |
130 | if (!(mode & FMODE_WRITE)) |
131 | return; | |
132 | ||
0d73a552 | 133 | mutex_lock(&iint->mutex); |
b151d6b0 | 134 | if (atomic_read(&inode->i_writecount) == 1) { |
0d73a552 DK |
135 | update = test_and_clear_bit(IMA_UPDATE_XATTR, |
136 | &iint->atomic_flags); | |
ac0bf025 | 137 | if (!IS_I_VERSION(inode) || |
c472c07b | 138 | !inode_eq_iversion(inode, iint->version) || |
b151d6b0 DK |
139 | (iint->flags & IMA_NEW_FILE)) { |
140 | iint->flags &= ~(IMA_DONE_MASK | IMA_NEW_FILE); | |
a422638d | 141 | iint->measured_pcrs = 0; |
0d73a552 | 142 | if (update) |
b151d6b0 DK |
143 | ima_update_xattr(iint, file); |
144 | } | |
2fe5d6de | 145 | } |
0d73a552 | 146 | mutex_unlock(&iint->mutex); |
bc7d2a3e EP |
147 | } |
148 | ||
3323eec9 MZ |
149 | /** |
150 | * ima_file_free - called on __fput() | |
151 | * @file: pointer to file structure being freed | |
152 | * | |
890275b5 | 153 | * Flag files that changed, based on i_version |
3323eec9 MZ |
154 | */ |
155 | void ima_file_free(struct file *file) | |
156 | { | |
496ad9aa | 157 | struct inode *inode = file_inode(file); |
f381c272 | 158 | struct integrity_iint_cache *iint; |
3323eec9 | 159 | |
0f34a006 | 160 | if (!ima_policy_flag || !S_ISREG(inode->i_mode)) |
3323eec9 | 161 | return; |
196f5181 | 162 | |
f381c272 | 163 | iint = integrity_iint_find(inode); |
854fdd55 MZ |
164 | if (!iint) |
165 | return; | |
3323eec9 | 166 | |
854fdd55 | 167 | ima_check_last_writer(iint, inode, file); |
3323eec9 MZ |
168 | } |
169 | ||
cf222217 MZ |
170 | static int process_measurement(struct file *file, char *buf, loff_t size, |
171 | int mask, enum ima_hooks func, int opened) | |
3323eec9 | 172 | { |
496ad9aa | 173 | struct inode *inode = file_inode(file); |
f7a859ff | 174 | struct integrity_iint_cache *iint = NULL; |
209b43ca | 175 | struct ima_template_desc *template_desc; |
ea1046d4 | 176 | char *pathbuf = NULL; |
bc15ed66 | 177 | char filename[NAME_MAX]; |
ea1046d4 | 178 | const char *pathname = NULL; |
0d73a552 | 179 | int rc = 0, action, must_appraise = 0; |
725de7fa | 180 | int pcr = CONFIG_IMA_MEASURE_PCR_IDX; |
1525b06d | 181 | struct evm_ima_xattr_data *xattr_value = NULL; |
d3634d0f | 182 | int xattr_len = 0; |
f7a859ff | 183 | bool violation_check; |
1525b06d | 184 | enum hash_algo hash_algo; |
3323eec9 | 185 | |
a756024e | 186 | if (!ima_policy_flag || !S_ISREG(inode->i_mode)) |
3323eec9 | 187 | return 0; |
bc7d2a3e | 188 | |
d79d72e0 MZ |
189 | /* Return an IMA_MEASURE, IMA_APPRAISE, IMA_AUDIT action |
190 | * bitmask based on the appraise/audit/measurement policy. | |
191 | * Included is the appraise submask. | |
192 | */ | |
725de7fa | 193 | action = ima_get_action(inode, mask, func, &pcr); |
4ad87a3d | 194 | violation_check = ((func == FILE_CHECK || func == MMAP_CHECK) && |
f7a859ff RS |
195 | (ima_policy_flag & IMA_MEASURE)); |
196 | if (!action && !violation_check) | |
2fe5d6de MZ |
197 | return 0; |
198 | ||
2fe5d6de | 199 | must_appraise = action & IMA_APPRAISE; |
bc7d2a3e | 200 | |
5a73fcfa | 201 | /* Is the appraise rule hook specific? */ |
3a8a2ead | 202 | if (action & IMA_FILE_APPRAISE) |
4ad87a3d | 203 | func = FILE_CHECK; |
5a73fcfa | 204 | |
5955102c | 205 | inode_lock(inode); |
2fe5d6de | 206 | |
f7a859ff RS |
207 | if (action) { |
208 | iint = integrity_inode_get(inode); | |
209 | if (!iint) | |
0d73a552 | 210 | rc = -ENOMEM; |
f7a859ff RS |
211 | } |
212 | ||
0d73a552 | 213 | if (!rc && violation_check) |
1b68bdf9 | 214 | ima_rdwr_violation_check(file, iint, action & IMA_MEASURE, |
4e8581ee | 215 | &pathbuf, &pathname, filename); |
0d73a552 DK |
216 | |
217 | inode_unlock(inode); | |
218 | ||
219 | if (rc) | |
220 | goto out; | |
221 | if (!action) | |
222 | goto out; | |
223 | ||
224 | mutex_lock(&iint->mutex); | |
225 | ||
226 | if (test_and_clear_bit(IMA_CHANGE_ATTR, &iint->atomic_flags)) | |
227 | /* reset appraisal flags if ima_inode_post_setattr was called */ | |
228 | iint->flags &= ~(IMA_APPRAISE | IMA_APPRAISED | | |
229 | IMA_APPRAISE_SUBMASK | IMA_APPRAISED_SUBMASK | | |
230 | IMA_ACTION_FLAGS); | |
231 | ||
232 | if (test_and_clear_bit(IMA_CHANGE_XATTR, &iint->atomic_flags)) | |
233 | /* reset all flags if ima_inode_setxattr was called */ | |
234 | iint->flags &= ~IMA_DONE_MASK; | |
bf2276d1 | 235 | |
2fe5d6de | 236 | /* Determine if already appraised/measured based on bitmask |
d79d72e0 MZ |
237 | * (IMA_MEASURE, IMA_MEASURED, IMA_XXXX_APPRAISE, IMA_XXXX_APPRAISED, |
238 | * IMA_AUDIT, IMA_AUDITED) | |
239 | */ | |
2fe5d6de | 240 | iint->flags |= action; |
0e5a247c | 241 | action &= IMA_DO_MASK; |
a422638d ER |
242 | action &= ~((iint->flags & (IMA_DONE_MASK ^ IMA_MEASURED)) >> 1); |
243 | ||
244 | /* If target pcr is already measured, unset IMA_MEASURE action */ | |
245 | if ((action & IMA_MEASURE) && (iint->measured_pcrs & (0x1 << pcr))) | |
246 | action ^= IMA_MEASURE; | |
2fe5d6de | 247 | |
da1b0029 MZ |
248 | /* HASH sets the digital signature and update flags, nothing else */ |
249 | if ((action & IMA_HASH) && | |
250 | !(test_bit(IMA_DIGSIG, &iint->atomic_flags))) { | |
251 | xattr_len = ima_read_xattr(file_dentry(file), &xattr_value); | |
252 | if ((xattr_value && xattr_len > 2) && | |
253 | (xattr_value->type == EVM_IMA_XATTR_DIGSIG)) | |
254 | set_bit(IMA_DIGSIG, &iint->atomic_flags); | |
255 | iint->flags |= IMA_HASHED; | |
256 | action ^= IMA_HASH; | |
257 | set_bit(IMA_UPDATE_XATTR, &iint->atomic_flags); | |
258 | } | |
259 | ||
2fe5d6de MZ |
260 | /* Nothing to do, just return existing appraised status */ |
261 | if (!action) { | |
d79d72e0 | 262 | if (must_appraise) |
4ad87a3d | 263 | rc = ima_get_cache_status(iint, func); |
0d73a552 | 264 | goto out_locked; |
2fe5d6de | 265 | } |
3323eec9 | 266 | |
209b43ca | 267 | template_desc = ima_template_desc_current(); |
f68c05f4 DK |
268 | if ((action & IMA_APPRAISE_SUBMASK) || |
269 | strcmp(template_desc->name, IMA_TEMPLATE_IMA_NAME) != 0) | |
1525b06d | 270 | /* read 'security.ima' */ |
e71b9dff | 271 | xattr_len = ima_read_xattr(file_dentry(file), &xattr_value); |
d3634d0f | 272 | |
1525b06d DK |
273 | hash_algo = ima_get_hash_algo(xattr_value, xattr_len); |
274 | ||
cf222217 | 275 | rc = ima_collect_measurement(iint, file, buf, size, hash_algo); |
f3cc6b25 | 276 | if (rc != 0 && rc != -EBADF && rc != -EINVAL) |
0d73a552 | 277 | goto out_locked; |
08e1b76a | 278 | |
bc15ed66 MZ |
279 | if (!pathbuf) /* ima_rdwr_violation possibly pre-fetched */ |
280 | pathname = ima_d_path(&file->f_path, &pathbuf, filename); | |
08e1b76a | 281 | |
2fe5d6de | 282 | if (action & IMA_MEASURE) |
bcbc9b0c | 283 | ima_store_measurement(iint, file, pathname, |
14b1da85 | 284 | xattr_value, xattr_len, pcr); |
0d73a552 DK |
285 | if (rc == 0 && (action & IMA_APPRAISE_SUBMASK)) { |
286 | inode_lock(inode); | |
4ad87a3d | 287 | rc = ima_appraise_measurement(func, iint, file, pathname, |
3034a146 | 288 | xattr_value, xattr_len, opened); |
0d73a552 DK |
289 | inode_unlock(inode); |
290 | } | |
e7c568e0 | 291 | if (action & IMA_AUDIT) |
ea1046d4 | 292 | ima_audit_measurement(iint, pathname); |
f7a859ff | 293 | |
f3cc6b25 MZ |
294 | if ((file->f_flags & O_DIRECT) && (iint->flags & IMA_PERMIT_DIRECTIO)) |
295 | rc = 0; | |
0d73a552 DK |
296 | out_locked: |
297 | if ((mask & MAY_WRITE) && test_bit(IMA_DIGSIG, &iint->atomic_flags) && | |
05d1a717 | 298 | !(iint->flags & IMA_NEW_FILE)) |
a175b8bb | 299 | rc = -EACCES; |
0d73a552 | 300 | mutex_unlock(&iint->mutex); |
f7a859ff | 301 | kfree(xattr_value); |
0d73a552 | 302 | out: |
456f5fd3 DK |
303 | if (pathbuf) |
304 | __putname(pathbuf); | |
0d73a552 DK |
305 | if (must_appraise) { |
306 | if (rc && (ima_appraise & IMA_APPRAISE_ENFORCE)) | |
307 | return -EACCES; | |
308 | if (file->f_mode & FMODE_WRITE) | |
309 | set_bit(IMA_UPDATE_XATTR, &iint->atomic_flags); | |
310 | } | |
750943a3 | 311 | return 0; |
3323eec9 MZ |
312 | } |
313 | ||
314 | /** | |
315 | * ima_file_mmap - based on policy, collect/store measurement. | |
316 | * @file: pointer to the file to be measured (May be NULL) | |
317 | * @prot: contains the protection that will be applied by the kernel. | |
318 | * | |
319 | * Measure files being mmapped executable based on the ima_must_measure() | |
320 | * policy decision. | |
321 | * | |
750943a3 DK |
322 | * On success return 0. On integrity appraisal error, assuming the file |
323 | * is in policy and IMA-appraisal is in enforcing mode, return -EACCES. | |
3323eec9 MZ |
324 | */ |
325 | int ima_file_mmap(struct file *file, unsigned long prot) | |
326 | { | |
750943a3 | 327 | if (file && (prot & PROT_EXEC)) |
cf222217 MZ |
328 | return process_measurement(file, NULL, 0, MAY_EXEC, |
329 | MMAP_CHECK, 0); | |
750943a3 | 330 | return 0; |
3323eec9 MZ |
331 | } |
332 | ||
333 | /** | |
334 | * ima_bprm_check - based on policy, collect/store measurement. | |
335 | * @bprm: contains the linux_binprm structure | |
336 | * | |
337 | * The OS protects against an executable file, already open for write, | |
338 | * from being executed in deny_write_access() and an executable file, | |
339 | * already open for execute, from being modified in get_write_access(). | |
340 | * So we can be certain that what we verify and measure here is actually | |
341 | * what is being executed. | |
342 | * | |
750943a3 DK |
343 | * On success return 0. On integrity appraisal error, assuming the file |
344 | * is in policy and IMA-appraisal is in enforcing mode, return -EACCES. | |
3323eec9 MZ |
345 | */ |
346 | int ima_bprm_check(struct linux_binprm *bprm) | |
347 | { | |
cf222217 MZ |
348 | return process_measurement(bprm->file, NULL, 0, MAY_EXEC, |
349 | BPRM_CHECK, 0); | |
3323eec9 MZ |
350 | } |
351 | ||
8eb988c7 MZ |
352 | /** |
353 | * ima_path_check - based on policy, collect/store measurement. | |
354 | * @file: pointer to the file to be measured | |
20f482ab | 355 | * @mask: contains MAY_READ, MAY_WRITE, MAY_EXEC or MAY_APPEND |
8eb988c7 MZ |
356 | * |
357 | * Measure files based on the ima_must_measure() policy decision. | |
358 | * | |
750943a3 DK |
359 | * On success return 0. On integrity appraisal error, assuming the file |
360 | * is in policy and IMA-appraisal is in enforcing mode, return -EACCES. | |
8eb988c7 | 361 | */ |
3034a146 | 362 | int ima_file_check(struct file *file, int mask, int opened) |
8eb988c7 | 363 | { |
cf222217 | 364 | return process_measurement(file, NULL, 0, |
20f482ab LZ |
365 | mask & (MAY_READ | MAY_WRITE | MAY_EXEC | |
366 | MAY_APPEND), FILE_CHECK, opened); | |
8eb988c7 | 367 | } |
9bbb6cad | 368 | EXPORT_SYMBOL_GPL(ima_file_check); |
8eb988c7 | 369 | |
05d1a717 MZ |
370 | /** |
371 | * ima_post_path_mknod - mark as a new inode | |
372 | * @dentry: newly created dentry | |
373 | * | |
374 | * Mark files created via the mknodat syscall as new, so that the | |
375 | * file data can be written later. | |
376 | */ | |
377 | void ima_post_path_mknod(struct dentry *dentry) | |
378 | { | |
379 | struct integrity_iint_cache *iint; | |
380 | struct inode *inode = dentry->d_inode; | |
381 | int must_appraise; | |
382 | ||
383 | must_appraise = ima_must_appraise(inode, MAY_ACCESS, FILE_CHECK); | |
384 | if (!must_appraise) | |
385 | return; | |
386 | ||
387 | iint = integrity_inode_get(inode); | |
388 | if (iint) | |
389 | iint->flags |= IMA_NEW_FILE; | |
390 | } | |
391 | ||
39eeb4fb MZ |
392 | /** |
393 | * ima_read_file - pre-measure/appraise hook decision based on policy | |
394 | * @file: pointer to the file to be measured/appraised/audit | |
395 | * @read_id: caller identifier | |
396 | * | |
397 | * Permit reading a file based on policy. The policy rules are written | |
398 | * in terms of the policy identifier. Appraising the integrity of | |
399 | * a file requires a file descriptor. | |
400 | * | |
401 | * For permission return 0, otherwise return -EACCES. | |
402 | */ | |
403 | int ima_read_file(struct file *file, enum kernel_read_file_id read_id) | |
404 | { | |
7c9bc098 BM |
405 | bool sig_enforce = is_module_sig_enforced(); |
406 | ||
a1db7420 | 407 | if (!file && read_id == READING_MODULE) { |
7c9bc098 | 408 | if (!sig_enforce && (ima_appraise & IMA_APPRAISE_MODULES) && |
9c655be0 BM |
409 | (ima_appraise & IMA_APPRAISE_ENFORCE)) { |
410 | pr_err("impossible to appraise a module without a file descriptor. sig_enforce kernel parameter might help\n"); | |
a1db7420 | 411 | return -EACCES; /* INTEGRITY_UNKNOWN */ |
9c655be0 | 412 | } |
a1db7420 MZ |
413 | return 0; /* We rely on module signature checking */ |
414 | } | |
39eeb4fb MZ |
415 | return 0; |
416 | } | |
417 | ||
d9ddf077 MZ |
418 | static int read_idmap[READING_MAX_ID] = { |
419 | [READING_FIRMWARE] = FIRMWARE_CHECK, | |
420 | [READING_MODULE] = MODULE_CHECK, | |
421 | [READING_KEXEC_IMAGE] = KEXEC_KERNEL_CHECK, | |
422 | [READING_KEXEC_INITRAMFS] = KEXEC_INITRAMFS_CHECK, | |
19f8a847 | 423 | [READING_POLICY] = POLICY_CHECK |
d9ddf077 MZ |
424 | }; |
425 | ||
cf222217 MZ |
426 | /** |
427 | * ima_post_read_file - in memory collect/appraise/audit measurement | |
428 | * @file: pointer to the file to be measured/appraised/audit | |
429 | * @buf: pointer to in memory file contents | |
430 | * @size: size of in memory file contents | |
431 | * @read_id: caller identifier | |
432 | * | |
433 | * Measure/appraise/audit in memory file based on policy. Policy rules | |
434 | * are written in terms of a policy identifier. | |
435 | * | |
436 | * On success return 0. On integrity appraisal error, assuming the file | |
437 | * is in policy and IMA-appraisal is in enforcing mode, return -EACCES. | |
438 | */ | |
439 | int ima_post_read_file(struct file *file, void *buf, loff_t size, | |
440 | enum kernel_read_file_id read_id) | |
441 | { | |
d9ddf077 | 442 | enum ima_hooks func; |
cf222217 | 443 | |
e40ba6d5 MZ |
444 | if (!file && read_id == READING_FIRMWARE) { |
445 | if ((ima_appraise & IMA_APPRAISE_FIRMWARE) && | |
446 | (ima_appraise & IMA_APPRAISE_ENFORCE)) | |
447 | return -EACCES; /* INTEGRITY_UNKNOWN */ | |
448 | return 0; | |
449 | } | |
450 | ||
a1db7420 MZ |
451 | if (!file && read_id == READING_MODULE) /* MODULE_SIG_FORCE enabled */ |
452 | return 0; | |
453 | ||
a7d3d039 CH |
454 | /* permit signed certs */ |
455 | if (!file && read_id == READING_X509_CERTIFICATE) | |
456 | return 0; | |
457 | ||
cf222217 MZ |
458 | if (!file || !buf || size == 0) { /* should never happen */ |
459 | if (ima_appraise & IMA_APPRAISE_ENFORCE) | |
460 | return -EACCES; | |
461 | return 0; | |
462 | } | |
463 | ||
d9ddf077 | 464 | func = read_idmap[read_id] ?: FILE_CHECK; |
cf222217 | 465 | return process_measurement(file, buf, size, MAY_READ, func, 0); |
5a9196d7 MZ |
466 | } |
467 | ||
3323eec9 MZ |
468 | static int __init init_ima(void) |
469 | { | |
470 | int error; | |
471 | ||
3f23d624 | 472 | ima_init_template_list(); |
e7a2ad7e | 473 | hash_setup(CONFIG_IMA_DEFAULT_HASH); |
3323eec9 | 474 | error = ima_init(); |
a756024e | 475 | if (!error) { |
31b70f66 | 476 | ima_initialized = 1; |
a756024e RS |
477 | ima_update_policy_flag(); |
478 | } | |
3323eec9 MZ |
479 | return error; |
480 | } | |
481 | ||
482 | late_initcall(init_ima); /* Start IMA after the TPM is available */ | |
483 | ||
484 | MODULE_DESCRIPTION("Integrity Measurement Architecture"); | |
485 | MODULE_LICENSE("GPL"); |